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RISS 인기검색어
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- 저자 : 김용래(Yonglae Kim) (검색결과 3 건)
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이기형(Kihyung Lee),김용래(Yonglae Kim),배재일(Jaeil Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the international regulations about the exhaust emission of the motorcycle have been strengthened. In case of the motorcycle engines, the quantity of the exhaust emission is larger than that of the car because of the carburetor type fuel supply system, which can not control the A/F precisely. Therefore, the electrically controlled fuel injection type motorcycle has been emphasized to meet with this regulation. However, since the pulsation phenomenon happens in the intake port of the motorcycle because of the characteristic of high speed and the smaller layout than the passenger car driving condition, there are many difficulties to select the factor about control parameters needed to develop the ECU system. For addition, an air flow rate is the important basis parameter at the ECU system. In this paper, the pulsation values measured from the engine test were compared with the calculated value by WAVE, and we analyzed the intake pressure characteristic according to the driving condition. Finally, an air flow rate is estimated by simulation method.
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전자제어식 이륜차 엔진의 연료 분사시기에 따른 증발 특성
강인보(Inbo Kang),이기형(Kihyung Lee),김용래(Yonglae Kim),백승국(Seungkook Baik) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study investigates the spray characteristics such as evaporation rate and trajectory between twin spray for the 4-hole injector which it is applied to 4-valve motorcycle gasoline engine. Three dimensional, unsteady, compressible flow and spray behavior within the port and cylinder has been simulated using the VECTIS code. The spray characteristics were investigated at 6000RPM engine speed. Furthermore, we visualized fuel behavior in the intake port by using CCD camera synchronized with the stroboscope in order to compare with simulated result. Boundary and intial conditions were employed by complete 1-D simulation of the engine using the WAVE CFD code. Fuel was injected into the port at two time interval relative to the position of the intake valves so that the spray arrived when the valves were closed and fully open. The results showed that the trajectory of the spray was directed towards the lower wall of the port with injection against the closed valves. With open valve injection, a large portion or the fuel was lifted by the co-flowing air towards the upper half of the port, this was confirmed by simulation and visualization.
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이기형(Kihyung Lee),남호성(Hosung Nam),김용래(Yonglae Kim),배재일(Jaeil Bae) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.3
Recently, the international regulations about the exhaust emissions of the motorcycle have been strengthened. The electrically controlled fuel injection type motorcycle has been emphasized to meet with this regulation. However, since the pulsation phenomenon happens in the intake port of the motorcycle because of the characteristic of high speed and the smaller layout than the passenger car, there are many difficulties to select the factor about control parameters needed to develop the ECU system. In this paper, the pulsation values measured from the engine test were compared with the calculated one by WAVE, and it was analyzed the pulsation characteristic according to the driving condition and estimated the mass flow rate. This research showed that the lowest point of the pressure gets lowin the low load and the pulsation of pressure were increased in the high load. Also, the simulation program was verified by showing good prediction of the pulsation and air mass flow rate.
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